Year	% of revenue
1994	1.0214632356619915
1995	1.6039619944330021
1996	1.318614625886769
1997	1.8536396907450403
1998	2.6439505393531832
1999	2.1098926326825973
2008	0.7691374744799984
2009	0.6986137634467694
2010	0.7587108451908089
2011	0.89050953182833
2012	1.1562841433367688
2013	1.6155583630029478
2014	1.1467646371764106
2015	1.5722678821954772
2016	1.0663304961043392
2017	0.927787415489875
2018	0.7375045954068549
2019	0.7244977349099757
2020	0.8553432647355049
2021	0.7241197352550626